Anisotropic superfluidity of 4He on a C36 fullerene molecule (original) (raw)
2015, The Journal of Chemical Physics
We have performed path-integral Monte Carlo calculations to study the adsorption of 4 He atoms on two different C 36 isomers with the D 6h and the D 2d symmetries. The radial 4 He density distributions reveal layer-by-layer growth with the first layer being located at a distance of ∼5.5 Å from the C 36 molecular center and the second layer at ∼8.3 Å. From the angular density profiles of 4 He, we find different quantum states as the number of 4 He adatoms N varies. For N = 20, we observe commensurate solid structures on both D 6h and D 2d isomers, where each of 8 hexagon and 12 pentagon centers of the fullerene surfaces is occupied by a single 4 He atom. The second-layer promotion starts beyond N = 38 on both isomers, where a compressible incommensurate structure is observed on the D 6h isomer and another commensurate structure on D 2d. Between N = 20 and N = 38, the 4 He monolayer on D 6h shows several distinct rings of delocalized 4 He atoms along with strongly anisotropic superfluid responses at low temperatures, while isotropic but weak superfluid responses are observed in the 4 He layer on D 2d .
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